OPTICAL CHARACTERIZATION OF A NEW INDICATOR DYE COVALENTLY BOUND ON CONTROLLED PORE GLASSES, POTENTIALLY SUITABLE AS OPTICAL TRANSDUCER FOR Hg(II)

Alberto Flamini,¹ Francesco Baldini², Alida Falai²

¹ Istituto di Chimica dei Materiali, ICMAT-CNR

Via Salaria, CP10, 00016 Monterotondo Stazione, Roma, Italy

² Istituto di Ricerca sulle Onde Elettromagnetiche "Nello Carrara", IROE-CNR

  Via Panciatichi 64, 50127, Firenze, Italy

The current paper describes a novel absorption-based optode for mercury (II) detection. The dye 2-(5-amino-3,4-dicyano-2H-pyrrol-2-ylidene)-1,1,2-tricyanoethanide (L', C₅N₃-C₄N(CN)₂-NH_2- ), which is a specific indicator for Hg(II) undergoing a colour change from violet to blue on the formation of the corresponding monochelated [HgL] complex, was covalently bound on a suitable matrix and its optical characterization as optode was performed in the presence of mercury acetate [Hg(AcO)₂] aqueous solutions.